In an article titled “Officials look for link in anthrax samples from labs,” the Associated Press reports that the FBI has used polygraph interrogations in its investigation of last year’s anthrax letter attacks. Excerpt:
The FBI believes the anthrax letters were the work of a single scientist, and some of the scientists fit aspects of the agency profile of the likely attacker, the officials said.
But no single suspect has emerged from among the group, and some of the scientists under scrutiny have passed polygraph exams, officials said.
Because polygraph “testing” has no validity and is easily defeated through the use of countermeasures, no one can be excluded as a subject by virtue of having passed a polygraph “test.”